Either corn head grease or CNH pourable high EP grease is an acceptable lube for vintage Ford steering gear boxes.
No, your seals will not stop seeping on their own.
The problem that you have is it will likely continue to seep until all of the 90W has leaked out, which will likely take years unless you remove the oil before replacing with one of the alternatives above.
Re: 640 Ford Steering Gear Box Lubricant.What to use ????? in reply to Dean, 04-29-2013 18:32:48
You dont need corn head grease,Cup grease is very soft.Many common greases are soft enough to work.I put grease in my JD 40 years ago on the advise of a JD parts man.He said you would need a pit to get the tricycle shaft out.I put grease in my 640 box after it leaked.The are 2 seals on each sector shaft.The 640 box can take on water if the skirt on the steering wheel does not cover the top of the steering box.
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